I did a little re-arranging of the generator version:
def interv3(inlist):
tmp = inlist[0]
valinc = tmp+1
for val in inlist[1:]:
if val != valinc:
yield [tmp, valinc];
tmp = val
valinc = val+1
yield [tmp, valinc]-- http://mail.python.org/mailman/listinfo/python-list
